Hello @nevetsyad,
Welcome back!
I would suggest to use a docker CLI instead of this outdated app: CLI Install - Storj Docs
There you will know, where you placed your identity and data and always can get the same result.
This app is a wrapper around docker, so basically you can use a command to see what were mount parameters for the container during the run:
In case of the QNAP App the name of the container you can get from the command:
docker ps -qf ancestor=storjlabs/storagenode
Or just
docker ps